Conversion specifier of long double in C

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From an old mingw wiki:

mingw uses the Microsoft C run-time
libraries and their implementation of
printf does not support the ‘long
double’ type. As a work-around, you
could cast to ‘double’ and pass that
to printf instead. For example:

printf("value = %g\n", (double) my_long_double_value);

Note that a
similar problem exists for ‘long long’
type. Use the ‘I64’ (eye sixty-four)
length modifier instead of gcc’s ‘ll’
(ell ell). For example:

printf("value = %I64d\n", my_long_long_value);

Edit (6 years later): Also see the comment below from Keith Thompson for a workaround:

#define __USE_MINGW_ANSI_STDIO 1 in the source file or change the command line to gcc -D__USE_MINGW_ANSI_STDIO=1

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